Process for separating relatively easily soluble...

Details Process for separating relatively easily soluble... Process for separating relatively easily soluble...

C - Chemistry, Metallurgy

07

C

202/76

C07C 7/08 (2006.01) B01D 3/40 (2006.01)

Patent

CA 1180301

ABSTRACT In a process for separating a specified relatively easily soluble hydrocarbon from a hydrocarbon mixture which comprises extractively distilling the hydrocarbon mixture in an extractive distillation apparatus composed of two stages of a unit consisting of an extractive distillation column and a stripping column using a polar extractive solvent, the improvement wherein a first-stage extractive distillation column is operated at a higher bottom pressure than the bottom pressure of a second-stage extractive distillation column, and a pre-stripping column is provided between the first-stage extractive distillation column and a first-stage stripping column, and by operating the pre-stripping column at a pressure equal to or lower than the bottom pressure of the first- stage extractive distillation column and equal to or higher than the bottom pressure of the second-stage extractive distillation column, a gas of the relatively easily soluble hydrocarbon generated in the pre- stripping column is directly sent to the second-stage extractive distillation column without going through the first-stage stripping column and a compressor or pump.

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